<template>
  <div :id="id" />
</template>

<script>
// deps for editor
import 'codemirror/lib/codemirror.css' // codemirror
import 'tui-editor/dist/tui-editor.css' // editor ui
import 'tui-editor/dist/tui-editor-contents.css' // editor content

import Editor from 'tui-editor'
import defaultOptions from './default-options'

export default {
  name: 'MarkdownEditor',
  props: {
    value: {
      type: String,
      default: ''
    },
    id: {
      type: String,
      required: false,
      default () {
        return 'markdown-editor-' + +new Date() + ((Math.random() * 1000).toFixed(0) + '')
      }
    },
    options: {
      type: Object,
      default () {
        return defaultOptions
      }
    },
    mode: {
      type: String,
      default: 'markdown'
    },
    height: {
      type: String,
      required: false,
      default: '300px'
    },
    language: {
      type: String,
      required: false,
      default: 'en_US' // https://github.com/nhnent/tui.editor/tree/master/src/js/langs
    }
  },
  data () {
    return {
      editor: null
    }
  },
  computed: {
    editorOptions () {
      const options = Object.assign({}, defaultOptions, this.options)
      options.initialEditType = this.mode
      options.height = this.height
      options.language = this.language
      return options
    }
  },
  watch: {
    value (newValue, preValue) {
      if (newValue !== preValue && newValue !== this.editor.getValue()) {
        this.editor.setValue(newValue)
      }
    },
    language (val) {
      this.destroyEditor()
      this.initEditor()
    },
    height (newValue) {
      this.editor.height(newValue)
    },
    mode (newValue) {
      this.editor.changeMode(newValue)
    }
  },
  mounted () {
    this.initEditor()
  },
  destroyed () {
    this.destroyEditor()
  },
  methods: {
    initEditor () {
      this.editor = new Editor({
        el: document.getElementById(this.id),
        ...this.editorOptions
      })
      if (this.value) {
        this.editor.setValue(this.value)
      }
      this.editor.on('change', () => {
        this.$emit('input', this.editor.getValue())
      })
    },
    destroyEditor () {
      if (!this.editor) return
      this.editor.off('change')
      this.editor.remove()
    },
    setValue (value) {
      this.editor.setValue(value)
    },
    getValue () {
      return this.editor.getValue()
    },
    setHtml (value) {
      this.editor.setHtml(value)
    },
    getHtml () {
      return this.editor.getHtml()
    }
  }
}
</script>
